TVLine is reporting that Seth Gabel has been promoted to a series regular on "Fringe." Gabel first appeared on the series during the second season as Lincoln Lee, an agent on the alternate universe "Fringe" team. During the third season, Gabel appeared on a recurring status, including one episode in which he portrayed the slightly nerdy Lincoln Lee of our universe.

Prior to "Fringe," Gabel appeared on "Nip/Tuck," "The Closer," "CSI," "The United States of Tara" and "Dirty Sexy Money."

POSSIBLE SPOILERS AHEAD!

During the third season finale of "Fringe," a new "bridge" was formed between the two dueling universes which will allow the cast to freely move between each one. Executive producer J.H. Wyman likened it to an airlock between the two worlds while explaining it to TVLine.

“You go out one door and you’re in our universe; you go out the other door and you’re in theirs,” noted Wyman before adding “It will be a well-kept secret.”

The other burning question is the fate of Peter Bishop (Joshua Jackson), who faded from existence after bringing the two universes together. And since so much of the series is predicated on Peter being present, some fans have questioned why the universes are at odds if not over Peter's abduction.

“Walter and [William] Bell were always trying to find a way to cross over, even before the Peter [abduction] incident,” answered "Fringe" executive producer, Jeff Pinkner. “So things may have happened differently.”

Wyman also confirmed that Jackson has not left the series, essentially confirming that Peter Bishop will be back at some point.

“[Jackson has] got a job. He’s still under contract,” admitted Wyman. “We can’t yet reveal what exactly we have in store for him, but he’s definitely not going out for other shows.”